31. In yeast signal transduction, a yeast cell releases a mating factor which (A) diffuses through the membranes to opposite type of cells, causing them to produce factors that initiate long-distance migrations (B) binds to receptors on the membranes of opposite type of yeast cells (C) passes through the membranes of opposite cell type, binds to DNA, and initiates transcription (D) acts back on the same cell type that secreted the mating factor, changing its cell division (E) Changes the shape of the opposite type of yeast cells

複選題35. Which of the following scientists were responsible for the following discovery? (A) Erwin Chargaff discovered that in DNA from any species, the amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine (B) Alfred Hershey and Martha Chase discovered that RNA can be converted to DNA by reverse transcription (C) James Watson and Francis Crick discovered that DNA is a double helix in structure (D) Oswald Avery, Maclyn McCarty, and Colin MacLeod discovered that DNA is genetic material (E) Matthew Meselson and Franklin Stahl discovered that DNA replication is semi- conservative

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